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Techniques for generating a trace stream for a data processing apparatus

Trace circuitry, and a method of operating such trace circuitry, are provided for generating a trace stream indicative of activities of monitored circuitry of a data processing apparatus. The monitored circuitry produces data elements indicative of those activities, and the trace circuitry comprises trace element generation circuitry which is responsive to at least some of the data elements produced by the monitored circuitry to generate trace elements representative of those data-elements, with the trace elements generated being dependent on a selected trace mode of operation of the trace circuitry. Compression circuitry is then arranged to apply an encoding operation to a sequence of trace elements in order to produce a packet whose bit pattern represents the sequence of trace elements, and to cause that packet to be output in the trace stream, the encoding operation applied being dependent on a current compression scheme associated with the compression circuitry. Whilst in the selected trace mode of operation, the compression circuitry is responsive to a compression change stimulus to change the current compression scheme from a first compression scheme to a second compression scheme whose bit pattern encoding space overlaps the bit pattern encoding space of the first compression scheme, such that following the change of compression scheme any further packets produced whilst in the selected trace mode of operation are produced in accordance with the second compression scheme. Such an approach has been found to provide improved compression efficiency thereby reducing the volume of trace data produced.
Owner:ARM LTD

Intelligent irrigation rain sensor

An intelligent irrigation rain sensor for use in an irrigation system comprises a rain sensor unit and a sensor control unit. The rain sensor unit has a rain catcher reservoir with an open top for receiving rainwater. The rain catcher has an internal volume for holding water and tapers into a funnel with an opening for metering equally sized round water droplets at a steady-state drip rate. At least one droplet detector is positioned directly below the funnel opening that contacts the water droplets from the funnel. The droplet detector includes detection electrodes for sensing a change in an electrical property being monitored by a detection control in the sensor control unit. Each droplet detected may be counted and the droplet count retained in a memory, or excluded from counting based on certain factors, such as the drip rate between droplets from the funnel opening. Upon exceeding a rain threshold amount over measurement time period, the intelligent irrigation rain sensor issues a rain signal to the irrigation controller. The intelligent irrigation rain sensor issues a corresponding dry signal to the irrigation controller after a drying period has elapsed. The present intelligent irrigation rain sensor may issue consecutive rain signals and accumulate drying periods for each, up to a predetermined limit, before issuing a single dry signal to the irrigation controller.
Owner:TELSCO INDS
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